// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef UI_GFX_GEOMETRY_RECT_F_H_
#define UI_GFX_GEOMETRY_RECT_F_H_

#include <string>

#include "ui/gfx/geometry/point_f.h"
#include "ui/gfx/geometry/rect_base.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/geometry/vector2d_f.h"

namespace gfx {

class InsetsF;

// A floating version of gfx::Rect.
class GFX_EXPORT RectF
    : public RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float> {
public:
    RectF()
        : RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>(SizeF())
    {
    }

    RectF(float width, float height)
        : RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>(SizeF(width, height))
    {
    }

    RectF(float x, float y, float width, float height)
        : RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>(PointF(x, y), SizeF(width, height))
    {
    }

    explicit RectF(const SizeF& size)
        : RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>(size)
    {
    }

    RectF(const PointF& origin, const SizeF& size)
        : RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>(origin, size)
    {
    }

    ~RectF() { }

    // Scales the rectangle by |scale|.
    void Scale(float scale)
    {
        Scale(scale, scale);
    }

    void Scale(float x_scale, float y_scale)
    {
        set_origin(ScalePoint(origin(), x_scale, y_scale));
        set_size(ScaleSize(size(), x_scale, y_scale));
    }

    // This method reports if the RectF can be safely converted to an integer
    // Rect. When it is false, some dimension of the RectF is outside the bounds
    // of what an integer can represent, and converting it to a Rect will require
    // clamping.
    bool IsExpressibleAsRect() const;

    std::string ToString() const;
};

inline bool operator==(const RectF& lhs, const RectF& rhs)
{
    return lhs.origin() == rhs.origin() && lhs.size() == rhs.size();
}

inline bool operator!=(const RectF& lhs, const RectF& rhs)
{
    return !(lhs == rhs);
}

inline RectF operator+(const RectF& lhs, const Vector2dF& rhs)
{
    return RectF(lhs.x() + rhs.x(), lhs.y() + rhs.y(),
        lhs.width(), lhs.height());
}

inline RectF operator-(const RectF& lhs, const Vector2dF& rhs)
{
    return RectF(lhs.x() - rhs.x(), lhs.y() - rhs.y(),
        lhs.width(), lhs.height());
}

inline RectF operator+(const Vector2dF& lhs, const RectF& rhs)
{
    return rhs + lhs;
}

GFX_EXPORT RectF IntersectRects(const RectF& a, const RectF& b);
GFX_EXPORT RectF UnionRects(const RectF& a, const RectF& b);
GFX_EXPORT RectF SubtractRects(const RectF& a, const RectF& b);

inline RectF ScaleRect(const RectF& r, float x_scale, float y_scale)
{
    return RectF(r.x() * x_scale, r.y() * y_scale,
        r.width() * x_scale, r.height() * y_scale);
}

inline RectF ScaleRect(const RectF& r, float scale)
{
    return ScaleRect(r, scale, scale);
}

// Constructs a rectangle with |p1| and |p2| as opposite corners.
//
// This could also be thought of as "the smallest rect that contains both
// points", except that we consider points on the right/bottom edges of the
// rect to be outside the rect.  So technically one or both points will not be
// contained within the rect, because they will appear on one of these edges.
GFX_EXPORT RectF BoundingRect(const PointF& p1, const PointF& p2);

#if !defined(COMPILER_MSVC)
extern template class RectBase<RectF, PointF, SizeF, InsetsF, Vector2dF, float>;
#endif

} // namespace gfx

#endif // UI_GFX_GEOMETRY_RECT_F_H_
